Once the top civilian supervising billions of dollars in work assignments from the Army Corps of Engineers, Bunnatine Greenhouse knows a thing or two about government contracts.

In 2005, Greenhouse explained to NOW's David Brancaccio how Halliburton and its subsidiaries were able to get preferential treatment, including billion-dollar contracts, for Iraq rebuilding projects.

She testified before Congress that the contracts awarded to one of these subsidiaries, KBR, represented the "most blatant and improper contract abuse" that she had witnessed during her 20 year tenure working for the government. Greenhouse's reward for whistleblowing? A demotion from her job as the top contract overseer.

This week, the Army announced it's discontinuing exclusive contracts with KBR to provide food, water, shelter, laundry service and other logistical support for troops under a 2001 contract that has been extended several times.

Critics have complained that Halliburton, the Texas-based oil services company run by Dick Cheney before he became vice president, has received preferential treatment from the Administration. Both the company and the administration have denied any wrongdoing.

NOW visits with Greenhouse to get her reaction. Does she feel vindicated?